地震沉积学在陆相湖盆三角洲砂体预测中的应用

地震沉积学是利用地震资料研究沉积岩及其形成过程的一门新兴边缘学科，是进行高频层序和沉积体系研究的有效工具，在油气勘探和开发方面具有明显效果。利用频谱分解和地层切片多属性综合分析技术，结合单井的岩性资料以及不同成因类型砂体的地貌形态，在中亚某盆地三维地震资料区下白垩统开展地震沉积学应用研究。通过对一系列典型地层切片的分析，可以看出研究层段主要为辫状河三角洲前缘水下分支河道砂体，纵向上朵叶体多期叠置，在辫状河三角洲水下分支河道砂体间沉积了相对稳定的薄层滨浅湖泥岩。

On Seismic Sedimentology of Lacustrine Deltaic Depositional Systems

Seismic sedimentology is the use of seismic data to study sedimentary rocks and the processes by which they are formed．It is a new traverse subject which is superior in mapping high frequency sequences and depositional systems and has got the obvious results in oil gas exploration and development．We use the techology of the frequency spectrum decomposition and stratal slicing, the key wells＇constraints to facies types, as well as the use of geomorphic features of different sand shapes to start seismic sedimentological studies in a certain basin of Central Asia．By analysising a series of typical stratal slices, we could find that the target zone is mainly subaqueous distributary channel of braided delta, the delta lobes override in vertical profile, thin layer lacustrine mudstone deposit between underwater distributary of braided delta．